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Check the audio settings to your TV first. If the audio is muted, or set low, there will be no audio. If there is audio with ariel signal, and audio is absent when connecting the AV cable, check it with a new AV cable.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".http://electronicshelponline.blogspot.com/

Step1Examine the back of your HDTV. You will see a series of input jacks for AV cables, (typically color-coded white and red for audio and yellow for video), as well as an antenna input and one or more HDMI input jacks. There will likely be a number of them, but each one should be distinguished with a label ("video," "cable" or something similar).
Step2Attach the cable connector from the cable or satellite receiver to the antenna input on the back of the TV.
Step3Connect the AV cables to the DVD player, VCR, stereo receiver or whichever other component you wish to connect to the television. The cables should line up by color: place the white cable in the white input jack, the red cable in the red input jack and the yellow cable in the yellow input jack. All three cables from each component need to go into the same label input jacks. Usually, they will all line up in a vertical row.
Step4Find the HDMI output jack on your receiver or DVD player (some receivers will not have them--they are necessary to receive a high definition signal--but can still play on the TV through the cable connector or AV cables). Attach one end of an HDMI cable to the output jack of the receiver and the other end into the input jack on the HDTV.
Step5Turn on the TV. Access the menu with your remote, and follow any instructions it gives you. Your HDTV may require a few additional steps to complete the hookup of the receiver (though not all of them will).
Step6Access the "input" button on your TV remote. This will allow you to switch the TV signal to one of the cable connections you have just made. For example, if you attached the HDMI cable to the first of two HDMI input jacks, the TV will flash "HDMI 1" on the screen to tell you that is where it is receiving its signal.
Hope that helps..........

Hello:The xbox came with an audio and video cable, probably componet cables on one end, if you are going to use HDTV input which is the red/grn/blue cables on the end of you xbox plug them into the corresponding color in the back of the tv, also on your cable is a switch labeled HTDT and TV make sure the switch is in the HDTV mode if you are going to connect the componet cables if you are going to use regular video then make sure its in the other posistion. If you use componet cables you are going to use the red an white audio cables also a total of five cables should be connected to the TV. Some newer xboxs have hdmi output as well this is the better of the three connections as it also has audio and hd all on one cable. using your tv's remote switch the tv's input to the same input you connected your xbox to. HAPPY GAMING..

Which generation playstation are you referring to The PS2 or PS3. The PS2 would be connected with a composite cable by default i.e red white and yellow cable. Connect the cable to the corresponding input on the TV, match color codes. Switch to correct input by using your remote controller. Press the AV button and a list of inputs come's up.Select av1 or av2 and check if you get a picture. If you use a ps3 then same as before press AV button on remote and select appropriate option on screen HDMI,Component or Composite.

It is likely that you don't have the right input to the television. First get a source that you know works. How about a DVD player.Get the cables from your DVD player (should be yellow RCA or "Phono" plug for the composite video out put.) Connect only the yellow video out put to your t.v. input and then press the av input button until you see the picture (note: besure that the DVD player is turned on and you have a dvd in it. We sometimes miss the very basics).

Once you get the picture than connect the audio cables, should be red and white to the corresponding colors. Do you have audio now?

If this test worked fine, it is likely that the solution to your other problem is that you have it on the wrong av input and need to press that button a few more times to find your satallite or cable input. There is a possibility that you are trying to use the tuner in your T.V. and it may be again as simple as choosing antenna input and that too needs to be hooked up to a good source.

This depends on how many available inputs you have on the back of the set. If you have more available you can just hook up the cable box composit (yellow, red, and white cables) if not you will need to replace the rf connector or tuner in the set. let me know if you need more help.

I'm assuming you mean you have HDMI coming out of the PS3 and going in to the DVI port on the back of the TV, via an adaptor or cable with a different connector on either end.
I have the same TV, you need a separate audio connection between ps3 and tv.
HDMI can transmit audio and video but DVI (which is what the TV has) can only do video.
You'll need a 2 x phono female to 3.5mm jack male adaptor cable.
like this one to make the audio connection.
you could also try this adaptor
but its a bit big and therefore may not fit into the space available.
after getting an adaptor do this (keep your original setup the same)
1. Put the ps3 AV cable into the back of the ps3.
2. then connect the red and white plugs (ignore the yellow) from the ps3 AV into the adaptor (discussed above).
3. then connect the 3.5mm jack (from the adaptor) into the small audio port right next to the DVI port on the back of the TV (I believe its called 'DVI Audio')
I've not tried this and I don't have a ps3, yet, but in theory it should work, as long as the ps3 will send
audio to the av output at the same time as to the hdmi output.
if it works, then post a response, i'd like to know for the future.
good luck